1. Biddle, S. (2002). Afghanistan and the future of warfare: Implications for army and defense policy (p. 68). Carlisle: Strategic Studies Institute, United States Army War College.
2. Boot, M. (2005). The struggle to transform the military. Foreign Affairs, 84(2), 103–118.
3. Carlsnaes, W. (2006). Foreign policy. In W. Carlsnaes, B. A. Simmons, & T. Risse (Eds.), Handbook of international relations (pp. 331–349). London/Thousand Oaks/New Delhi: Sage Publications.
4. Coleman, D. (2006). Immigration and ethnic change in low-fertility countries: A third demographic transition. Population and Development Review, 32(3), 401–446.
5. Coleman, D. (2012). The changing face of Europe. In J. A. Goldstone, E. P. Kaufmann, & M. D. Toft (Eds.), Political demography. How population changes are reshaping international security and national politics (pp. 176–193). New York: Oxford University Press. 342.